Paper stock pulper



June 16, 1953 E. A. ELLIS 2,641,971

PAPER s'rocx PULPER Filed Feb. '7, 1949 2 Sheets-Sheet 1 June 16, 1953 E. A. ELLIS 2,641,971

PAPER STOCK PULPER Filed Feb. 7, 1949 2' Sheets-Sheet 2 Patented June 16, 1953' UNITED: [STATES PATENT OFFICE,

a 2, 41,971 r Y I V P PER STOCK B EB. Enri'ght A. Ellis Villanova, Pa, assignor to Downingtown Manufacturing Company; Downing-' town, Pa'., a. corporation of Pennsylvania Ann iclation i b u x v. 194a,.seria1imncaae (owe-s23) 7 Claims.

. 1 lfhis invention relates to new and useful 1mprove nents apparatus for treating fibrous paper stock material, and more particularly to apparatus for pulping and." extracting material" used in the manufacture of paper. I

The principal object of the present invention is t0. proriide, apparatus'of' the stated type which is characterized byitsfflbre liberating action and 1 .gleyoid Qf dead spots for the accumulation 7 material.

'Another object of the present invention is to, provide a fibre treating'apparatus asset forth which has a rapid pulping action and produces maximum fibre separation with a minimum of fibre hydration.

A iurther object of the present invention is to, provide novel pulping apparatus as set forth which. embodies a novel construction and arrangement of tank or vessel in which the fibrous material is treated,

Still a further object of the invention is to provide novel apparatus having the ieatures and characteristics set forth which is of relatively simplified construction, is comparatively inexpensive to manufacture and ishighly efli'cient'and eif ective in operation and use.v

Ifhese and other objects. of the invention and' the various features and details of the construeu per endportion of a' vertically extending shaft" wardly from the axis of the impeller;

thereof with arelatively largecircular opening 6 and within this opening thereis rotationally mounted the plate portion 7 of an impeller 8 havmg outer and inner sets of blades or vanes 9 and lil; respectively; The impeller 8 is fixed upon the equally spaced intervals thereabout; As shown,

these blades 9 gradually increase in-height'out'- On the other hand; the blades Hi of the inner set are,

arranged substantially spirally of the axis and decreasein height outwardly therefrom. It will --be obvious, of course, that otherblade arrangetion and operation thereof, arerhereinafterj fully set forth and'desc'ribed with reference, to the accompan ins d a n in wh ch:

Fig lis a side elevational view partially in ,sec,-'

ti -n. f, appar s. mad ccor ing t thep es nt.

invention;

Fig. 2 is a sectionalview, of the apparatus; and

Figs. 3; and lare plan and perspective, views, respectively, illustrating the action, that takes place. I

Referring now more particularly to the draw ings; apparatus for treating fibrous material prises a tank or vat I the, sidewall 2. of which is vertical and includes three or more concave lobes or flutes-3 spaced about the axis of thet'ank.

In the illustrated embodiment of the invention; t ejhottqm. i o h ki sinrovided; coaxiallr The tank I is provided with.

' v1ded d ametrically by adam; or partition 25 over' which the extractedstock isadapted'jto flow and.

ments and configurations may be employed as desired.

- I I v Inaccordance w th the present invention, the

lower portion of the adjacent lobes 3, from the bottom :1 to a predetermined height thereabove, are provided with openings I l therein through which the treated fibrous material is extracted. Thesize and numberofthe openings It provided in-anygiven instance will depend upon thenature of the'stock treated and the fineness of the pulp that it is desired to produce.

Surrounding the exterior of the lower portion ot- 'the tanlel' to a-heightjust above the extractionopening-s M therein is a cylindrical housing lt comprising anouter vertical wall member l6, atop member I! and aninner bottom member it; the -said" outer wall member is extending downwardly entirely to the edge of the so-called sub-bottom 5-of-thetank. The housing [5 cooperates with the tank wall 2' to provide outwardly of the openings it suitable extraction chambers lil into-which the treated stock'is extracted from 40, made according to the, present invention com the tank l-th-rough said openings;

Stock extracted from the tank l intothe chambers l t is conveyed by means of suitablepipes'zil, Zi and 22 toa common connection 23' atthe-lower posed verticallyadjacentthe tank' I, and is. di-' then pass down the other'side-of the. pipe 2'6 to. theintakeofa suitable stock refiner 2i; driven by a-1notor" H: In lieu of the refinerZEthe'eX tracted stock may be admitted directly to a'chest, thickener or other stock treating device. The height of thejdam' 25 is adjustable with relation to'the level of, the'stock in theftankand by regulating the height, of thedam. the rate or, speed of extraction of the stock may be controlled so that the pulper may be operated and stock fed thereto and extracted as a continuous process with adequate control of the rate of discharge and hence the length of treatment afiorded the stock.

The concave lobes 3 of the tank side wall 2 may be of the same uniform arcuate cross-sectional configuration being defined by the arcs of circles of selected radius or may, for example, have a non-uniform cross-sectional curvature. In operation, the rotation of the impeller 8 causes the material to be forced outward and upward and the lobes 3 cause it to be directed inward again and returned to the impeller, for example, as indicated in Figs. 3 and 4 of the drawings. Due to the deflecting action of the side wall lobes 3 which directs the material again and again back to the impeller 8, the impeller produces the maximum possible fibre liberation and mixing effect upon the material undergoing treatment so that a minimum of time is required for the necessary pulping action to take place.

In the continuous operation of the apparatus, particularly where waste paper is to be defibred, it, is desirable to provide for the continuous removal of the trash which is always present in waste paper as supplied to the mill. For the removal of heavy materials, the apparatus may be provided with a suitable form of the usual trash chute (not shown) and for the removal of lighter trash materials a suitable ragger (not shown) is provided.

In the case of batch operation, the action of the impeller 8 and lobes 3 upon the material is the same as described. However, the openings It in the side wall 2 may be eliminated thus providing a solid wall, and the entire batch of material, after treatment is completed, may be withdrawn from the bottom of the tank I through a, suitable outlet such as indicated at 23 and controlled by a valve 28.

From the foregoing it will be observed that the present invention provides novel fibre treating apparatus which is characterized by its superior fibre liberation and is devoid of dead spots in which the material can accumulate. ihe invention also provides apparatus as set forth which has a rapid pulping action and produces maximum fibre separation with a minimum of fibre hydration. Furthermore, the apparatus of the present invention embodies a relatively simplified construction, is comparatively inexpensive to manufacture and is highly efiicient and effective in operation and use.

While a particular embodiment of the invention has been illustrated and described herein, it not intended to limit the invention to such disclosure, and changes and modifications may be made therein and thereto within the scope of the following claims.

I claim:

1. Apparatus for treating fibrous paper stock material comprising a tank having a flat bottom and a vertical side wall provided with at least three upwardly extending concave lobes arranged uniformly with respect to the axis of the tank, a rotary impeller mounted in the bottom of the tank for rotation axially thereof, and means for withdrawing treated material from said tank.

2. Apparatus for treating fibrous paper stock material comprising a tank having a flat bottom and a vertical side wall provided with at least three upwardly extending concave lobes arranged uniformly with respect to the axis of the 4 tank, the lobes of the tank being arcs of circles of a predetermined radius, a rotary impeller mounted in the bottom of the tank for rotation axially thereof, and means for withdrawing treated material from said tank.

3. Apparatus for treating fibrous paper stock material comprising a tank having a fiat bottom and a vertical sidewall formed of at least three upwardly extending arcuate lobes arranged uniformly about the axis of the tank, the lobes of the tank each being the arc of a circle of selected radius, a rotary impeller. having outer and inner sets of blades mounted in the bottom of the tank for rotation axially thereof, and means for with-- drawing treatedmaterial from said tank.

l. Apparatus for treating fibrous paper stock material comprising a tank having a fiat bottom and a vertical sidewall provided with at least three upwardly extending concave lobes arof for the treated material, and means for Withdrawing the treated material from said extraction cham-- bers.

- 5. Apparatus for treating fibrous paper stock material comprising a tank having a fiat bottom and a vertical side wall provided with at ,least,

concave lobes ar-- ranged uniformly with respect to the axis of the tank, the lobes of the tank being arcs of circlesv three upwardly extending of selected radius and each having a plurality of small openings in the lower portion thereof for extraction of treated material therethrough,. a rotary impeller mounted in the bottom of the: tank for rotation axially thereof, means sur-- rounding the tank outwardly adjacent the area of said extraction openings therein and providing in cooperation with the tank a plurality of' extraction chambers for receiving the treatedv material, and means for Withdrawing the treat ed material from said extraction chambers.

6. Apparatus for treating fibrous paper stock material comprisinga tank having a fiat bottom and a vertical side wall constituted of a succession of at least three upwardly extending concave lobes arranged uniformly with respect to the axis of the tank, the lobes of the tank each having a plurality of small openings in the lower portion thereof for extraction of treated material therethrough, .a rotary impeller having outer and inner sets of blades mounted in the bottom of the tank for rotation axially thereof, a housing exteriorly of the tank outwardly adjacent the area of said extraction openings therein and providing in cooperation with the tank a plurality of extraction chambers for receiving the treated material, and means for withdrawing the treated material from said extraction chambers.

'7. Apparatus for treating fibrous paper stock material comprising a tank having a fiat bottom and a vertical side wall provided with at least three upwardly extending arcuate lobes arranged uniformly with respect to the axis of the tank, the lobes of the tank being the arcs of circles of selected radius and each having a plurality of small openings in the lower portion thereof for extraction of treated material there- 5 through, a rotary impeller having outer and innor sets of blades mounted in the bottom of the tank for rotation axially thereof, a structure exteriorly of the tank outwardly adjacent the area of said extraction openings therein and. providing in cooperation with the tank a plurality of extraction chambers for receiving the treated material, and means for withdrawing the treated material from said extraction chambers.

ENRIGHT A. ELLIS.

References Cited in the file of this patent UNITED STATES PATENTS 7 Date Number Name Re. 4.976 Gould July 16, 1872 26,109 Jebb Nov. 15, 1859 33,262 Mudge Sept. 10, 1861 161,281 Rupert Mar. 23, 1875 Number 15 Number 

